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Fair Value - Qualitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Impaired loans | $ 3,574 | $ 5,983
Other real estate owned | 5,247,021 | 5,161,919
Nonrecurring basis |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Impaired loans | 3,574 | 5,983
Other real estate owned | 6,520 | 6,897
Commercial real estate | Nonrecurring basis |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Impaired loans | 2,735 | 3,057
Other real estate owned | 2,295 | 2,644
Commercial real estate | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Impaired loans | 2,735 | 3,057
Construction real estate | Nonrecurring basis |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other real estate owned | 3,204 | 3,322
Commercial | Nonrecurring basis |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Impaired loans | 127 | 541
Commercial | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Impaired loans | 127 | 541
Residential real estate | Nonrecurring basis |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Impaired loans | 712 | 2,385
Other real estate owned | 1,021 | 931
Residential real estate | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Impaired loans | 712 | 2,385
Commercial real estate | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other real estate owned | 2,295 | 2,644
Construction real estate | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other real estate owned | 3,204 | 3,322
Residential Real Estate | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other real estate owned | $ 1,021 | $ 931
Sales comparison approach | Commercial real estate | Low | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 0.00% | 0.00%
Sales comparison approach | Commercial real estate | High | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 90.00% | 90.00%
Sales comparison approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 22.70% | 20.20%
Sales comparison approach | Commercial | Low | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 0.00% | 0.00%
Sales comparison approach | Commercial | High | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 4.80% | 11.10%
Sales comparison approach | Commercial | Weighted Average [Member] | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 2.40% | 1.60%
Sales comparison approach | Residential real estate | Low | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 0.00% | 0.30%
Sales comparison approach | Residential real estate | High | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 33.00% | 110.00%
Sales comparison approach | Residential real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 12.50% | 17.00%
Sales comparison approach | Commercial real estate | Low | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 0.00% | 0.00%
Sales comparison approach | Commercial real estate | High | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 68.40% | 68.40%
Sales comparison approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 34.70% | 26.50%
Sales comparison approach | Construction real estate | Low | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 0.00% | 0.00%
Sales comparison approach | Construction real estate | High | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 90.00% | 90.00%
Sales comparison approach | Construction real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 24.50% | 24.70%
Sales comparison approach | Residential Real Estate | Low | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 1.20% | 3.20%
Sales comparison approach | Residential Real Estate | High | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 79.70% | 79.70%
Sales comparison approach | Residential Real Estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Adj to comparables | 31.80% | 30.60%
Income approach | Commercial real estate | Low | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Capitalization rate | 9.00% | 9.00%
Income approach | Commercial real estate | High | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Capitalization rate | 11.00% | 10.60%
Income approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Capitalization rate | 9.90% | 10.10%
Income approach | Residential real estate | Low | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Capitalization rate | 10.50% | 10.00%
Income approach | Residential real estate | High | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Capitalization rate | 10.50% | 10.00%
Income approach | Residential real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Capitalization rate | 10.50% | 10.00%
Income approach | Commercial real estate | Low | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Capitalization rate | 13.00% | 13.00%
Income approach | Commercial real estate | High | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Capitalization rate | 13.00% | 14.00%
Income approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Capitalization rate | 13.00% | 13.10%
Cost approach | Commercial real estate | Low | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Fair Value Inputs, Accumulated Depreciation | 90.10% | 17.00%
Cost approach | Commercial real estate | High | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Fair Value Inputs, Accumulated Depreciation | 90.10% | 18.00%
Cost approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Fair Value Inputs, Accumulated Depreciation | 90.10% | 17.80%
Bulk sale approach | Commercial | Low | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Discount rate |  | 10.00%
Bulk sale approach | Commercial | High | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Discount rate |  | 10.00%
Bulk sale approach | Commercial | Weighted Average [Member] | Nonrecurring basis | Loans receivable |  |
Fair Value Inputs [Abstract] |  |
Discount rate |  | 10.00%
Bulk sale approach | Construction real estate | Low | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Discount rate | 15.00% | 15.00%
Bulk sale approach | Construction real estate | High | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Discount rate | 15.00% | 15.00%
Bulk sale approach | Construction real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned |  |
Fair Value Inputs [Abstract] |  |
Discount rate | 15.00% | 15.00%

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- Definition Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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